Nite Ize Inka Mobile Pen and Stylus (IMP-M1-R7) The Inka Mobile is designed to go where you go, write where you need it to write, and stay where you want it to stay so it's always conveniently at hand. Inka Mobile Pen + Stylus With its compact size, durable construction, reliable performance, and replaceable pressurized blue ink cartridge, the Inka Mobile is designed to be everything you need in a pen and stylus. Features a replaceable pressurized blue ink cartridge that gives the Inka Mobile it's amazing ability to write in extreme conditions Dimensions: 4.25" x 0.71" x 0.43", 108mm x 18mm x 11mm, Weight: 0.35 oz, 10g